How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask Dodgerench Your Own Question
Dodgerench
Dodgerench, ASE Certified Technician
Category: Dodge
Satisfied Customers: 3385
Experience:  30+ years Dodge/Chrysler exp., ASE Master with L1 certification. Driveability/ combustion specialist
4486286
Type Your Dodge Question Here...
Dodgerench is online now
A new question is answered every 9 seconds

2002 Dakota 3.9 l crank no start,put spark tester on and if

Customer Question

2002 Dakota 3.9 l crank no start,put spark tester on and if I crank for 20 seconds I get literally one spark and that's it,,,,,,removed plug from coil and have power on one side when cranking but nothing on other wire,when unplugged anyway,,,,,also pulled up pids for crank sensor and goes up too 157 and cam sensor only goes up to 27 when cranking
Submitted: 11 months ago.
Category: Dodge
Expert:  Dodgerench replied 11 months ago.

Hi, welcome to JustAnswer!. This is Ed.

Questions to start...

What's the story on your Dakota? Did it die while driving? Fail to start one morning? Been sitting in storage for a long time?

Was the problem intermittent at some time? Or is this the first time it's acted up?

When you found one spark (and one spark only) where were you testing? At the coil itself or at a plug wire?

What was the intensity of the spark? Did it seem normal? Weak?

And since you've seen PIDs, chances are good that you were able to check for codes. I'd expect something to show up. What did you find?

Ed

Customer: replied 11 months ago.
Came out in morning and wouldn't start,pulled coil wire off of cap n ckd at cap on coil wire
Customer: replied 11 months ago.
No codes
Customer: replied 11 months ago.
Smell fuel
Expert:  Dodgerench replied 11 months ago.

Ooooo. Good info. All good info, thanks.

Sounds like you need a coil.

You're apparently getting fuel injector pulse... which requires cam and crank sensor signals AND that they be in-sync.

You've got ASD output to the coil positive terminal, which positively shows that the PCM (engine controller) is awake and has recognized cam and crank signals. (This is a cascade sort of thing, bear with me)

I believe the coil has suffered an insulation failure on the secondary side of the unit. If it was a primary-side failure, you'd have a coil control circuit failure code, which hasn't been set. The coil is apparently good on the 12v side, but the high-tension (spark) side is shorting back internally to ground.

Stuff a new coil on your 3.9 and I think you'll be burning gas again tomorrow. Holding the accelerator wide open to clear excessive fuel may be needed.

Ed

Customer: replied 11 months ago.
I will try in am n let u know ty
Expert:  Dodgerench replied 11 months ago.

Sounds good. It's all I can ask of you!

Ed

Related Dodge Questions